mongodb副本集维护总结

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同福客栈郭芙蓉 2019-03-06 17:08:17 博主文章分类：DB ©著作权

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参考：https://blog.51cto.com/caiyuanji 副本集维护：副本集成员最多12个成员，其中只有7个成员拥有投票权。这是为了减少心跳请求的网络流量和选举话费的时间。心跳每2秒发送一次。仲裁者唯一的作用就是参与选举，仲裁者并不保存数据，也不会为客户端提供服务。成员一旦以仲裁者的身份加入副本集中，它就永远只能是仲裁者，无法将仲裁者重新配置为非仲裁者，反之亦然。最多只能有一个仲裁者每个副本集中。修改副本集成员的优先级： conf=rs.conf() #将rs.conf的值定义给conf test:PRIMARY> conf.members[0].priority=3
3 test:PRIMARY> conf.members[1].priority=2 2 #这里[0]并不是rs.status()里的id号，而是谁在第一位谁就是0，从0开始。 test:PRIMARY> rs.reconfig(conf) test:PRIMARY> rs.conf() { "_id" : "test", "version" : 2, "protocolVersion" : NumberLong(1), "writeConcernMajorityJournalDefault" : true, "members" : [ { "_id" : 0, "host" : "zhuzhu:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 100, "tags" : {

		},
		"slaveDelay" : NumberLong(0),
		"votes" : 1
	},
	{
		"_id" : 1,
		"host" : "gougou:27017",
		"arbiterOnly" : false,
		"buildIndexes" : true,
		"hidden" : false,
		"priority" : 90,
		"tags" : {
			
		},
		"slaveDelay" : NumberLong(0),
		"votes" : 1
	}
],
"settings" : {
	"chainingAllowed" : true,
	"heartbeatIntervalMillis" : 2000,
	"heartbeatTimeoutSecs" : 10,
	"electionTimeoutMillis" : 10000,
	"catchUpTimeoutMillis" : -1,
	"catchUpTakeoverDelayMillis" : 30000,
	"getLastErrorModes" : {
		
	},
	"getLastErrorDefaults" : {
		"w" : 1,
		"wtimeout" : 0
	},
	"replicaSetId" : ObjectId("5c2da4fc134c17137419c065")
}

}

主从切换成功关于优先级范围从0 至 1000 (3.2以上版本) ，优先级越大，越可能成为primary；若优先级为0，则该节点无资格参与primary的选举。如果希望某节点不参与primary的选举有两种方法： 1、将该节点优先级设置为0；2、rs.freeze(30) 在cluster选举primary时，将该节点暂时冻结30S。如果希望将本primary节点降为secondary状态，可以执行 rs.stepDown() 。

在副本集中添加和删除成员： test:PRIMARY> rs.status() #查看副本集状态 { "set" : "test", "date" : ISODate("2019-01-07T03:21:06.774Z"), "myState" : 1, "term" : NumberLong(13), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "heartbeatIntervalMillis" : NumberLong(2000), "optimes" : { "lastCommittedOpTime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "readConcernMajorityOpTime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "appliedOpTime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "durableOpTime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) } }, "lastStableCheckpointTimestamp" : Timestamp(1546831238, 1), "members" : [ { "_id" : 0, "name" : "zhuzhu:27017", "health" : 1, "state" : 1, "stateStr" : "PRIMARY", "uptime" : 1830, "optime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "optimeDate" : ISODate("2019-01-07T03:21:03Z"), "syncingTo" : "", "syncSourceHost" : "", "syncSourceId" : -1, "infoMessage" : "", "electionTime" : Timestamp(1546830032, 1), "electionDate" : ISODate("2019-01-07T03:00:32Z"), "configVersion" : 2, "self" : true, "lastHeartbeatMessage" : "" }, { "_id" : 1, "name" : "gougou:27017", "health" : 1, "state" : 2, "stateStr" : "SECONDARY", "uptime" : 1251, "optime" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "optimeDurable" : { "ts" : Timestamp(1546831263, 1), "t" : NumberLong(13) }, "optimeDate" : ISODate("2019-01-07T03:21:03Z"), "optimeDurableDate" : ISODate("2019-01-07T03:21:03Z"), "lastHeartbeat" : ISODate("2019-01-07T03:21:05.954Z"), "lastHeartbeatRecv" : ISODate("2019-01-07T03:21:05.060Z"), "pingMs" : NumberLong(0), "lastHeartbeatMessage" : "", "syncingTo" : "zhuzhu:27017", "syncSourceHost" : "zhuzhu:27017", "syncSourceId" : 0, "infoMessage" : "", "configVersion" : 2 } ], "ok" : 1, "operationTime" : Timestamp(1546831263, 1), "$clusterTime" : { "clusterTime" : Timestamp(1546831263, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } test:PRIMARY> rs.remove("gougou:27017") #移除成员 { "ok" : 1, "operationTime" : Timestamp(1546831380, 1), "$clusterTime" : { "clusterTime" : Timestamp(1546831380, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } }

test:PRIMARY> rs.add("gougou:27017") #添加成员 { "ok" : 1, "operationTime" : Timestamp(1546831434, 1), "$clusterTime" : { "clusterTime" : Timestamp(1546831434, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } }

test:PRIMARY> rs.conf() #查看副本集的优先级 { "_id" : "test", "version" : 4, "protocolVersion" : NumberLong(1), "writeConcernMajorityJournalDefault" : true, "members" : [ { "_id" : 0, "host" : "zhuzhu:27017", "arbiterOnly" : false, "buildIndexes" : true, "hidden" : false, "priority" : 100, "tags" : {

		},
		"slaveDelay" : NumberLong(0),
		"votes" : 1
	},
	{
		"_id" : 1,
		"host" : "gougou:27017",
		"arbiterOnly" : false,
		"buildIndexes" : true,
		"hidden" : false,
		"priority" : 1,
		"tags" : {
			
		},
		"slaveDelay" : NumberLong(0),
		"votes" : 1
	}
],
"settings" : {
	"chainingAllowed" : true,
	"heartbeatIntervalMillis" : 2000,
	"heartbeatTimeoutSecs" : 10,
	"electionTimeoutMillis" : 10000,
	"catchUpTimeoutMillis" : -1,
	"catchUpTakeoverDelayMillis" : 30000,
	"getLastErrorModes" : {
		
	},
	"getLastErrorDefaults" : {
		"w" : 1,
		"wtimeout" : 0
	},
	"replicaSetId" : ObjectId("5c2da4fc134c17137419c065")
}